Very cool rifle an fun to shoot. A friend of mine has one and I've helped him with it a few times. Things to keep in mind is your mag changes won't be as fast an the trigger in stock configuration absolutely sucks.
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However, there is an aftermarket mod that is supposed to greatly help with the...
Definitely go with the metal form. The Cprod's suck no consistency in feeding. Another thing to keep in mind is to buy some cheap uzi mags from cdnn an either mod them yourself or have someone cut'm for ya. Makes a nice easy fix.
Well if you can use a "rifle" caliber I'd say go with an Encore in 243. Great caliber for youth/women and when turkey season roll's around you could slap a 20ga barrel and
save some coin. Not to mention the weight an familiarity is nice bonus as well.
My fun 22 is built of a nordic upper. But for accuracy I just started working on it. Its a CZ455 Varmint, it will take a little bit to build up but it will be good when done.
The Glock has more value an more well built. If you want to shoot it ported you can buy an after market barrel and go at it that way. The 34/35 series is a nice series and has great balance (at least in my opinion).
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But of course goes with what works best for you. There are some tricks to...
I'm a big glock fan but was pleasantly suprised by the m&p's. Keep them in mind or try. A little different grip angle but still good guns. NOT cheap like the sigmas a few yrs ago.